I was doing some tank maintenance today and when I went behind the tank I noticed all these little things hanging to the glass inside the overflow. At first I thought they were just chunks of algae, but then I noticed that they sort of have antennae and they are all shaped the same. Am I seeing things or are these some sort of little critters? If I had to guess, I'd say that they look like baby snails without a shell. I often have a wild imagination. The tank has several types of snails in it. Nothing out of the ordinary though, as far as I know. Thanks for the help.